{
  "type": "FunctionExpression",
  "start":0,"end":40,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":40}},
  "id": null,
  "generator": false,
  "async": false,
  "params": [
    {
      "type": "AssignmentPattern",
      "start":10,"end":23,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":23}},
      "left": {
        "type": "Identifier",
        "start":10,"end":11,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":11},"identifierName":"a"},
        "name": "a"
      },
      "right": {
        "type": "StringLiteral",
        "start":14,"end":23,"loc":{"start":{"line":1,"column":14},"end":{"line":1,"column":23}},
        "extra": {
          "rawValue": "default",
          "raw": "\"default\""
        },
        "value": "default"
      }
    }
  ],
  "body": {
    "type": "BlockStatement",
    "start":25,"end":40,"loc":{"start":{"line":1,"column":25},"end":{"line":1,"column":40}},
    "body": [],
    "directives": [
      {
        "type": "Directive",
        "start":26,"end":39,"loc":{"start":{"line":1,"column":26},"end":{"line":1,"column":39}},
        "value": {
          "type": "DirectiveLiteral",
          "start":26,"end":38,"loc":{"start":{"line":1,"column":26},"end":{"line":1,"column":38}},
          "extra": {
            "raw": "\"use strict\"",
            "rawValue": "use strict"
          },
          "value": "use strict"
        }
      }
    ]
  },
  "errors": [
    "SyntaxError: Illegal 'use strict' directive in function with non-simple parameter list. (1:0)"
  ]
}